that's more or less right, in both the math and the actual rate, but i believe that the OEM springs are progressive rate, meaning they get stiffer as they get compressed. i don't know what coefficient you'd use to factor this in, either.

you'd also have to factor in unsprung weight, as parts of the suspension and the wheels are not a part of the total load on the springs. then, you also have to consider what angle the springs are at, and use some trig to see how much of mg is in the negative y direction (vs x and z). hmm that's all i can think of for now, but good work :thumbup: